Elementary lessons in electricity & magnetism (1895)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · New York and London, Macmillan and co. · leaf 28
y are then similarly electrified. The ball ??, therefore,is driven round and twists the wire up to a certain extent.The force of repulsion becomes less and less as n getsfarther and farther from m; but the force of the twistgets greater and greater the more the wire is twisted.Hence these two… … chap, i LAW OF INVERSE SQUARES 21 distance through which the ball is repelled is read off inangular degrees of the scale. When a wire is twisted,the force with which it tends to untwist is precisely pro-portional to the amount of the twist. The force requiredto twist the wire ten degrees is just…
Electricity
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